A "racing prototype" refers to a specially designed and built vehicle that is created for competing in races. It is not a regular car but a unique model made specifically for high-performance and speed in racing events. Full definition
There should be a few seats going spare too - will we see Button racing a prototype next year? (wtf1.com)
Struggling to slow down, Habul's Mercedes smashed into the No. 90 VisitFlorida Racing prototype driven by Renger van der Zande. (wtf1.com)
The swathe of bonnet vents and the Perspex Gurney flap across the boot are pure race prototype, as is the undertray that cradles the twin, sideways - mounted and side - exiting silencers and tailpipes. (evo.co.uk)